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Active filter control method and system

A technology of source filter and control method, which is applied in the field of power transmission system, can solve problems such as the excessive harmonic level of the commutation busbar, and achieve the effect of suppressing the amplification of background harmonics, reducing the level of harmonics, and clear control targets

Active Publication Date: 2021-04-13
STATE GRID ECONOMIC TECH RES INST CO +1
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Problems solved by technology

[0005] In view of the above problems, the object of the present invention is to provide an active filter control method and system, which can solve the problem that the harmonic level of the converter bus bar seriously exceeds the standard caused by the background harmonic amplification of the AC system of the HVDC power transmission project, and the control effect Stable and flexible, not affected by the impedance of the AC system, and can respond to different control objectives

Method used

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Embodiment

[0156] In this embodiment, a simulation is performed on an active filter control method for suppressing background harmonic amplification in a HVDC power transmission project.

[0157] Hybrid filter branches such as Figure 12 As shown, the active filter is connected to the 500kV AC bus through a passive filter. The general steps of APF input are: 1. Before the APF is ready to unlock, disconnect the circuit breaker. At this time, the APF enters the uncontrollable charging mode, and the IGBT bypass protection is activated after charging to a certain voltage, and the capacitor voltage maintains the current level (if the IGBT sub-module is not used for a long time). unlock, the voltage level will gradually be consumed by energy acquisition and parasitic resistance), and then the IGBT unlock pulse is issued, and the APF enters the working mode.

[0158] In order to avoid overcharging of the capacitor voltage, the bypass control triggered after the capacitor voltage is charged to ...

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Abstract

The invention relates to an active filter control method and system. The method comprises the following steps of selecting a basic topological structure that an active filter is connected to a high-voltage power grid through a passive filter, setting the harmonic capacity of the active filter, and setting a current detection point, obtaining a power grid current according to the current value of the detection point, comparing the power grid current with the APF output current, and obtaining the modulation voltage of the APF by using the proportionality coefficient K. The method is not influenced by the impedance change of an AC system, and can achieve a target control effect. And when the control targets are different, different filtering effects can be achieved respectively. The problem that the harmonic level of the converter bus seriously exceeds the standard due to background harmonic amplification of the AC system of the high-voltage direct current transmission project can be solved, and the control effect is stable and flexible.

Description

technical field [0001] The invention relates to the technical field of power transmission systems, in particular to an active filter control method and system for suppressing background harmonic amplification of high-voltage direct current power transmission projects. Background technique [0002] With the development of power electronic technology, the problem of harmonics in power systems has become more and more prominent. For example, power companies use a large number of capacitor banks to improve power factor, and power electronic converters are widely used in the industry to improve system reliability and efficiency. Traditional harmonic sources mainly include nonlinear loads, such as transformers, electric arc furnaces, and industrial smelting. The harmonic characteristics of the power grid are becoming more and more complex. In the high-voltage transmission network, the configuration of passive filters may amplify the harmonic source of the AC system, causing the ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18H02J3/36
CPCH02J3/01H02J3/1842H02J3/36H02J2003/365Y02E40/20Y02E60/60Y02E40/40
Inventor 王玲乐波季一鸣杨一鸣吴方劼常怡然申笑林杜商安郝致远
Owner STATE GRID ECONOMIC TECH RES INST CO
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